Use a rs485 communication module

@Gordon, the 7x7 display is around 80€ wo VAT + 23€ for shipping to France + paypal fee
there is an USB version for 5€ more.

the baud rate is 9600 or 19200, 38400, 57600 (physical dipswitch on the board)
there is no fonts for the display, it's just a screen, you have to draw your font and convert char to bits

by ex.
Send all white dots to all connected panels (address 0xFF) and turn dots as soon as data is received.

0x80 0x87 0xFF 0x7F 0x7F 0x7F 0x7F 0x7F 0x7F 0x7F 0x8F

0x80: header
0x87: command (show)
0xff: address (panel)
7 * 0x7f: display data "b01111111"
0x8f: end char

therefor your exemple need to be converted from hex value to 0/1.
is it good way?

parseInt(num, baseFrom).toString(baseTo);

regards

é.